Michael Phelps completed his comeback meet in international competition with a gold medal in the medley relay to cap off a Sunday night program that kicked off with Katie Ledecky setting her second world record within 24 hours at the Pan Pacific championships.

Katie Ledecky broke the world record in the 400-meter freestyle at the U.S. national championships Saturday night, becoming the first woman since Janet Evans to hold world marks in the 400, 800 and 1,500 freestyles at the same time.